Special tires?

[BrianG]

I was going to try to fill a MT tire with air, but figured the required pressure would make it too easy to pop if I go over any kind of sharp object (R/C tires aren't exactly thick-walled), and sealing it properly would be a PITA.

Yeah, I figure the first one will be the toughest. But I only need two (since I'm making a front-wheel drive setup), so by the time I have the process down, I'll be done.